Incidents were classified as school shootings when a firearm was discharged inside a school building or on school or campus grounds, as documented in publicly reported news accounts. This includes assaults, homicides, suicides, and accidental shootings. Incidents in which guns were brought into schools but not fired there, or were fired off school grounds after having been possessed in schools, were not included.

The last shooting in Idaho was in 1999 in Notus when a 15 year old boy fired two rounds from a shotgun he got from home. No one was seriously physically harmed in that incident.